scholarly journals A biobased Schiff base from protocatechualdehyde and its application in flame-retardant, low-smoke epoxy resin systems

RSC Advances ◽  
2019 ◽  
Vol 9 (53) ◽  
pp. 30815-30822 ◽  
Author(s):  
Weiqi Xie ◽  
Shiwen Huang ◽  
Shumei Liu ◽  
Jianqing Zhao
Keyword(s):  
Schiff Base ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Schiff Base Compound ◽  
Base Compound

A novel bio-based Schiff base compound PH-ODA was successfully synthesized and acted as a carbonization agent of IFRs for fire-safe epoxy resins.

scholarly journals An Effective Method for Preparation of Liquid Phosphoric Anhydride and Its Application in Flame Retardant Epoxy Resin

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2205
Author(s):  
Qian Li ◽  
Yujie Li ◽  
Yifan Chen ◽  
Qiang Wu ◽  
Siqun Wang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Ease Of Use ◽  
Limiting Oxygen Index ◽  
Good Thermal Stability ◽  
Low Viscosity ◽  
The Impact

A novel liquid phosphorous-containing flame retardant anhydride (LPFA) with low viscosity was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and methyl tetrahydrophthalic anhydride (MeTHPA) and further cured with bisphenol-A epoxy resin E-51 for the preparation of the flame retardant epoxy resins. Both Fourier transform infrared spectroscopy (FT-IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR) measurements revealed the successful incorporation of DOPO on the molecular chains of MeTHPA through chemical reaction. The oxygen index analysis showed that the LPFA-cured epoxy resin exhibited excellent flame retardant performance, and the corresponding limiting oxygen index (LOI) value could reach 31.2%. The UL-94V-0 rating was achieved for the flame retardant epoxy resin with the phosphorus content of 2.7%. With the addition of LPFA, the impact strength of the cured epoxy resins remained almost unchanged, but the flexural strength gradually increased. Meanwhile, all the epoxy resins showed good thermal stability. The glass transition temperature (Tg) and thermal decomposition temperature (Td) of epoxy resin cured by LPFA decreased slightly compared with that of MeTHPA-cured epoxy resin. Based on such excellent flame retardancy, low viscosity at room temperature and ease of use, LPFA showed potential as an appropriate curing agent in the field of electrical insulation materials.

Thermal Stabilities and the Thermal Degradation Kinetics Study of the Flame Retardant Epoxy Resins

2014 ◽  
Vol 1053 ◽  
pp. 263-267 ◽  
Author(s):  
Xiu Juan Tian
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Degradation Kinetics ◽  
Thermal Degradation Kinetics ◽  
Thermal Stabilities ◽  
Degradation Kinetic ◽  
Modified Epoxy

Thermal stability and thermal degradation kinetics of epoxy resins with 2-(Diphenylphosphinyl)-1, 4-benzenediol were investegated by thermogravimetric analysis (TGA) at different heating rates of 5 K/min, 10 K/min, 20 K/min and 40 K/min. The thermal degradation kinetic mechanism and models of the modified epoxy resins were determined by Coast Redfern method.The results showed that epoxy resins modified with the flame retardant had more thermal stability than pure epoxy resin. The solid-state decomposition mechanism of epoxy resin and the modified epoxy resin corresponded to the controlled decelerating ځ˽̈́˰̵̳͂͆ͅ˼˰̴̱̾˰̸̵̈́˰̵̸̳̱̹̽̾̓̽˰̶̳̹̾̈́̿̾̓ͅ˰̶˸ځ˹˰̵̵͇͂˰̃˸́˽ځ˹2/3. The introduction of phosphorus-containing flame retardant reduced thermal degradation rate of epoxy resins in the primary stage, and promote the formation of carbon layer.

Synthesis of a phosphorus–nitrogen-containing flame retardant and its application in epoxy resin

2018 ◽  
Vol 31 (2) ◽  
pp. 186-196 ◽  
Author(s):  
Shuang Yang ◽  
Yefa Hu ◽  
Qiaoxin Zhang
Keyword(s):  
Heat Release ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Heat Release Rate ◽  
Flame Retardancy ◽  
Release Rate ◽  
Epoxy Resins ◽  
Proton Nuclear Magnetic Resonance ◽  
Scanning Calorimetry ◽  
Cone Calorimeter Test

In this article, a phosphorus–nitrogen-containing flame retardant (DOPO-T) was successfully synthesized by nucleophilic substitution reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and cyanuric chloride. The chemical structure of DOPO-T was characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance (NMR) and phosphorous-31 NMR, and elemental analysis. DOPO-T was then blended with diglycidyl ether of bisphenol-A to prepare flame-retardant epoxy resins. Thermal properties, flame retardancy, and combustion behavior of the cured epoxy resins were evaluated by differential scanning calorimetry, thermogravimetric analysis, limited oxygen index (LOI) measurement, UL94 vertical burning test, and cone calorimeter test. The results indicated that the glass transition temperature ( Tg) and temperature at 5% weight loss of epoxy resin (EP)/DOPO-T thermosets were gradually decreased with the increasing content of DOPO-T. DOPO-T catalyzed the decomposition of EP matrix in advance. The flame-retardant performance of EP thermosets was significantly enhanced with the addition of DOPO-T. EP/DOPO-T-0.9 sample had an LOI value of 36.2% and achieved UL94 V-1 rating. In addition, the average of heat release rate, peak of heat release rate, average of effective heat of combustion, and total heat release (THR) of EP/DOPO-T-0.9 sample were decreased by 32%, 48%, 23%, and 31%, respectively, compared with the neat EP sample. Impressively, EP/DOPO-T thermosets acquired excellent flame retardancy under low loading of flame retardant.

Azido bridged binuclear copper(ii) Schiff base compound: synthesis, structure and electrical properties

2019 ◽  
Vol 43 (41) ◽  
pp. 16255-16263
Author(s):  
Mrinmoy Ghosh ◽  
Sandip Saha ◽  
Abhijit Banerjee ◽  
Dieter Schollmeyer ◽  
Ananda Sarkar ◽  
...  
Keyword(s):  
Schiff Base ◽  
Electrical Properties ◽  
Binuclear Copper ◽  
Current Voltage ◽  
Compound Synthesis ◽  
Current Voltage Characteristics ◽  
Schiff Base Compound ◽  
Base Compound

The structure, FESEM, Al/complex/ITO microstructure and the current–voltage characteristics of the copper(ii) azido bridged dimer.

Synthesis, crystal structure, and magnetic properties of a new tetranuclear Cu(II) Schiff base compound

2009 ◽  
Vol 362 (8) ◽  
pp. 2915-2920 ◽  
Author(s):  
Moumita Biswas ◽  
Guillaume Pilet ◽  
Javier Tercero ◽  
M. Salah El Fallah ◽  
Samiran Mitra
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Schiff Base ◽  
Schiff Base Compound ◽  
Base Compound

Electrical property and Schottky behavior of a flexible Schiff-base compound: X-ray structure and stabilization of 1D water chain

2018 ◽  
Vol 20 (38) ◽  
pp. 24744-24749 ◽  
Author(s):  
Basudeb Dutta ◽  
Joydeep Datta ◽  
Suvendu Maity ◽  
Chittaranjan Sinha ◽  
Di Sun ◽  
...  
Keyword(s):  
Schiff Base ◽  
Electrical Property ◽  
Impedance Spectroscopy ◽  
Schottky Diode ◽  
X Ray ◽  
X Ray Crystallography ◽  
Water Chain ◽  
Schiff Base Compound ◽  
Base Compound

A flexible Schiff-base compound has been synthesized and structurally confirmed by X-ray crystallography. The compound behaves as a Schottky diode, as supported by the impedance spectroscopy.

scholarly journals Preparation and properties of flame-retardant epoxy resins containing reactive phosphorus flame retardant

2020 ◽  
Vol 15 ◽  
pp. 155892502090132
Author(s):  
Sang-Hoon Lee ◽  
Seung-Won Oh ◽  
Young-Hee Lee ◽  
Il-Jin Kim ◽  
Dong-Jin Lee ◽  
...  
Keyword(s):  
Impact Strength ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Phosphorus Content ◽  
Phosphorus Compound ◽  
Phosphorus Compounds ◽  
Limiting Oxygen Index ◽  
The Impact

To prepare flame-retardant epoxy resin, phosphorus compound containing di-hydroxyl group (10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phospha phenanthrene-10-oxide, DOPO-HQ) was reacted with uncured epoxy resin (diglycidyl ether of bisphenol A, YD-128) and then cured using a curing agent (dicyandiamide, DICY). This study focused on the effect of phosphorus compound/phosphorus content on physical properties and flame retardancy of cured epoxy resin. The thermal decomposition temperature of the cured epoxy resins (samples: P0, P1.5, P2.0, and P2.5, the number represents the wt% of phosphorus) increased with increasing the content of phosphorus compound/phosphorus (0/0, 19.8/1.5, 27.8/2.0, and 36.8/2.5 wt%) based on epoxy resin. The impact strength of the cured epoxy resin increased significantly with increasing phosphorus compound content. As the phosphorus compound/phosphorus content increased from 0/0 to 36.8/2.5 wt%, the glass transition temperature (the peak temperature of loss modulus curve) increased from 135.2°C to 142.0°C. In addition, as the content of phosphorous compound increased, the storage modulus remained almost constant up to higher temperature. The limiting oxygen index value of cured epoxy resin increased from 21.1% to 30.0% with increasing phosphorus compound/phosphorus content from 0/0 to 36.8/2.5 wt%. The UL 94 V test result showed that no rating for phosphorus compounds less than 19.8 wt% and V-1 for 27.8 wt%. However, when the phosphorus compound was 36.8 wt%, the V-0 level indicating complete flame retardancy was obtained. In conclusion, the incorporation of phosphorus compounds into the epoxy chain resulted in improved properties such as impact strength and heat resistance, as well as a significant increase in flame retardancy.

scholarly journals 4-Chloro-2-[(4-chlorobenzylidene)amino]phenol

2012 ◽  
Vol 68 (6) ◽  
pp. o1696-o1696 ◽  
Author(s):  
Kürşat Efil ◽  
Fatih Şen ◽  
Yunus Bekdemir ◽  
Orhan Büyükgüngör
Keyword(s):  
Hydrogen Bond ◽  
Schiff Base ◽  
Double Bond ◽  
Dihedral Angle ◽  
One Dimensional ◽  
Compound C ◽  
Benzene Rings ◽  
Amino Phenol ◽  
Schiff Base Compound ◽  
Base Compound

In the title Schiff base compound, C13H9Cl2NO, the molecule displays an E conformation about the imine C=N double bond, with a dihedral angle of 8.09 (11)° between the two benzene rings. In the crystal, molecules are linked by a single O—H...O hydrogen bond, giving one-dimensional chains which extend along (100).

scholarly journals Flame retardant epoxy resin based on organic titanate and polyhedral oligomeric silsesquioxane-containing additives with synergistic effects

RSC Advances ◽  
2017 ◽  
Vol 7 (42) ◽  
pp. 26082-26088 ◽  
Author(s):  
Birong Zeng ◽  
Yongzhou Liu ◽  
Li Yang ◽  
Wei Zheng ◽  
Ting Chen ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Synergistic Effects ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Tetrabutyl Titanate ◽  
System P ◽  
Oligomeric Silsesquioxane

In order to develop epoxy resins possessing good thermal, mechanical, and flame retardancy performance, a synthesized POSS-bisDOPO was used as co-additive with tetrabutyl titanate to construct the ternary phosphorous–silicon–titanium synergy system.

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